2004 INFINITI QX56 Factory Service Manual

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Page 1641 of 3371

INFINITI QX56 2004 Factory Service Manual EC-450Revision: August 2007
DTC P1273, P1283 A/F SENSOR 1
2004 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals

Page 1642 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1273, P1283 A/F SENSOR 1
EC-451
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Revision: August 20072004 QX56
3. CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1. Start engine and warm it up to normal operating temper

Page 1643 of 3371

INFINITI QX56 2004 Factory Service Manual EC-452Revision: August 2007
DTC P1273, P1283 A/F SENSOR 1
2004 QX56
4. CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Turn igniti

Page 1644 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1273, P1283 A/F SENSOR 1
EC-453
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Revision: August 20072004 QX56
6. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect E

Page 1645 of 3371

INFINITI QX56 2004 Factory Service Manual EC-454Revision: August 2007
DTC P1274, P1284 A/F SENSOR 1
2004 QX56
DTC P1274, P1284 A/F SENSOR 1PFP:22693
Component DescriptionUBS00HA0
The air fuel ratio (A/F) sensor 1 is a planar dual-cell limit c

EC-454Revision: August 2007
DTC P1274, P1284 A/F SENSOR 1
2004 QX56
DTC P1274, P1284 A/F SENSOR 1PFP:22693
Component DescriptionUBS00HA0
The air fuel ratio (A/F) sensor 1 is a planar dual-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is the combination of a
Nernst concentration cell (sensor cell) with an oxygen-pump cell,
which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range (0.7 <
< air).
The exhaust gas components diffuse through the diffusion gap at the
electrode of the oxygen pump and Nernst concentration cell, where
they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygen-
pump cell so that the composition of the exhaust gas in the diffusion
gap remains constant at = 1. Therefore, the A/F sensor 1 is able to
indicate air/fuel ratio by this pumping of current. In addition, a heater
is integrated in the sensor to ensure the required operating tempera-
ture of 700 - 800°C (1,292 - 1,472°F).
CONSULT-II Reference Value in Data Monitor ModeUBS00HA1
Specification data are reference values.
On Board Diagnosis LogicUBS00HA2
To judge the malfunction, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored not to be
shifted to the LEAN side or RICH side.
DTC Confirmation ProcedureUBS00HA3
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON and select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CON-
SULT-II.
SEF 5 79 Z
SEF 5 80 Z
MONITOR ITEM CONDITION SPECIFICATION
A/F SEN1 (B1)
A/F SEN1 (B2)
Engine: After warming upMaintaining engine speed at
2,000 rpmFluctuates around 1.5V
DTC No. Trouble diagnosis name DTC detecting condition Possible Cause
P1274
1274
(Bank 1)
Air fuel ratio (A/F) sensor 1
rich shift monitoring
The A/F signal computed by ECM from the
A/F sensor 1 signal is shifted to the rich side
for a specified period.
Air fuel ratio (A/F) sensor 1
Air fuel ratio (A/F) sensor 1 heater
Fuel pressure
Injector P1284
1244
(Bank 2)

Page 1646 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1274, P1284 A/F SENSOR 1
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Revision: August 20072004 QX56
4. Clear the self-learning coefficient by touching “CLEAR”.
5. Turn ignition switch OFF and wait at le

Page 1647 of 3371

INFINITI QX56 2004 Factory Service Manual EC-456Revision: August 2007
DTC P1274, P1284 A/F SENSOR 1
2004 QX56
Wiring Diagram UBS00HA4
BANK 1
BBWA1369E

Page 1648 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1274, P1284 A/F SENSOR 1
EC-457
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Revision: August 20072004 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not

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